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Long-Term Debt (6.25% Senior Secured Notes, Due 2023 Narrative) (Details) - USD ($)
12 Months Ended
Feb. 06, 2020
May 12, 2017
Mar. 16, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]            
Issuance of long-term debt       $ 3,042,000,000 $ 1,033,000,000 $ 3,100,000,000
Senior Secured Notes [Member] | Senior Secured Notes at 6.25%, Due 2023 [Member]            
Debt Instrument [Line Items]            
Debt instrument, offering date       Mar. 16, 2017    
Debt instrument aggregate principal amount   $ 3,100,000,000 $ 2,200,000,000      
Issuance of long-term debt   900,000,000        
Debt instrument stated interest rate     6.25%      
Senior Secured Notes [Member] | Senior Secured NotesAt 5.125% Due 2018 [Member]            
Debt Instrument [Line Items]            
Extinguishment of debt amount     $ 700,000,000      
Secured Debt [Member] | Credit Facility, Term Loan F [Member]            
Debt Instrument [Line Items]            
Extinguishment of debt amount     $ 1,445,000,000      
Secured Debt [Member] | Credit Facility, Term Loan A [Member]            
Debt Instrument [Line Items]            
Extinguishment of debt amount   $ 713,000,000        
Subsequent Event [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 6.25%, Due 2023 [Member]            
Debt Instrument [Line Items]            
Debt instrument aggregate principal amount $ 426,000,000          
Subsequent Event [Member] | Secured Debt [Member] | Senior Secured Notes at 6.25%, Due 2023 [Member]            
Debt Instrument [Line Items]            
Extinguishment of debt amount $ 426,000,000          
Debt instrument stated interest rate 6.25%          
Debt Instrument, Redemption, Period One [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 6.25%, Due 2023 [Member]            
Debt Instrument [Line Items]            
Debt instrument redemption price percentage     100.00%      
Debt instrument redemption description       plus a "make-whole" premium, as described in the indenture governing the 6¼% Senior Secured Notes due 2023.    
Minimum period notice for redemption of debt     30 days      
Maximum period notice for redemption of debt     60 days      
Debt Instrument, Redemption, Period Two [Member] | Senior Secured Notes [Member] | Senior Secured Notes at 6.25%, Due 2023 [Member]            
Debt Instrument [Line Items]            
Maximum principal redeemable using proceeds from a public equity offering, as a percentage of principal amount     40.00%      
Debt instrument redemption price percentage     106.25%